When I killed my mortgage, the bank tried the same spiel on me - "leave your title deed with us to look after, much safer for you",
Told them no thanks - she got rather pushy, with the line that their safe was better than a drawer at my home.
She gave up when I told her it wasn't getting stashed in a drawer, it was going in my ammo safe

[actually - it is in my properly awesome big safe, which is in the archives vault, in the tunnel at work]